forceCoeffs.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "forceCoeffs.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace functionObjects
{
    defineTypeNameAndDebug(forceCoeffs, 0);
    addToRunTimeSelectionTable(functionObject, forceCoeffs, dictionary);
}
}


// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //

void Foam::functionObjects::forceCoeffs::writeFileHeader(const label i)
{
    if (i == 0)
    {
        // force coeff data

        writeHeader(file(i), "Force coefficients");
        writeHeaderValue(file(i), "liftDir", liftDir_);
        writeHeaderValue(file(i), "dragDir", dragDir_);
        writeHeaderValue(file(i), "pitchAxis", pitchAxis_);
        writeHeaderValue(file(i), "magUInf", magUInf_);
        writeHeaderValue(file(i), "lRef", lRef_);
        writeHeaderValue(file(i), "Aref", Aref_);
        writeHeaderValue(file(i), "CofR", coordSys_.origin());
        writeCommented(file(i), "Time");
        writeTabbed(file(i), "Cm");
        writeTabbed(file(i), "Cd");
        writeTabbed(file(i), "Cl");
        writeTabbed(file(i), "Cl(f)");
        writeTabbed(file(i), "Cl(r)");
    }
    else if (i == 1)
    {
        // bin coeff data

        writeHeader(file(i), "Force coefficient bins");
        writeHeaderValue(file(i), "bins", nBin_);
        writeHeaderValue(file(i), "start", binMin_);
        writeHeaderValue(file(i), "delta", binDx_);
        writeHeaderValue(file(i), "direction", binDir_);

        vectorField binPoints(nBin_);
        writeCommented(file(i), "x co-ords  :");
        forAll(binPoints, pointi)
        {
            binPoints[pointi] = (binMin_ + (pointi + 1)*binDx_)*binDir_;
            file(i) << tab << binPoints[pointi].x();
        }
        file(i) << nl;

        writeCommented(file(i), "y co-ords  :");
        forAll(binPoints, pointi)
        {
            file(i) << tab << binPoints[pointi].y();
        }
        file(i) << nl;

        writeCommented(file(i), "z co-ords  :");
        forAll(binPoints, pointi)
        {
            file(i) << tab << binPoints[pointi].z();
        }
        file(i) << nl;

        writeCommented(file(i), "Time");

        for (label j = 0; j < nBin_; j++)
        {
            const word jn('(' + Foam::name(j) + ')');
            writeTabbed(file(i), "Cm" + jn);
            writeTabbed(file(i), "Cd" + jn);
            writeTabbed(file(i), "Cl" + jn);
        }
    }
    else
    {
        FatalErrorInFunction
            << "Unhandled file index: " << i
            << abort(FatalError);
    }

    file(i)<< endl;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::functionObjects::forceCoeffs::forceCoeffs
(
    const word& name,
    const Time& runTime,
    const dictionary& dict
)
:
    forces(name, runTime, dict),
    liftDir_(Zero),
    dragDir_(Zero),
    pitchAxis_(Zero),
    magUInf_(0.0),
    lRef_(0.0),
    Aref_(0.0)
{
    read(dict);
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::functionObjects::forceCoeffs::~forceCoeffs()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

bool Foam::functionObjects::forceCoeffs::read(const dictionary& dict)
{
    forces::read(dict);

    // Directions for lift and drag forces, and pitch moment
    dict.lookup("liftDir") >> liftDir_;
    dict.lookup("dragDir") >> dragDir_;
    dict.lookup("pitchAxis") >> pitchAxis_;

    // Free stream velocity magnitude
    dict.lookup("magUInf") >> magUInf_;

    // Reference length and area scales
    dict.lookup("lRef") >> lRef_;
    dict.lookup("Aref") >> Aref_;

    return true;
}


bool Foam::functionObjects::forceCoeffs::execute()
{
    return true;
}


bool Foam::functionObjects::forceCoeffs::write()
{
    forces::calcForcesMoment();

    if (Pstream::master())
    {
        writeFiles::write();

        scalar pDyn = 0.5*rhoRef_*magUInf_*magUInf_;

        Field<vector> totForce(force_[0] + force_[1] + force_[2]);
        Field<vector> totMoment(moment_[0] + moment_[1] + moment_[2]);

        List<Field<scalar>> coeffs(3);
        coeffs[0].setSize(nBin_);
        coeffs[1].setSize(nBin_);
        coeffs[2].setSize(nBin_);

        // lift, drag and moment
        coeffs[0] = (totForce & liftDir_)/(Aref_*pDyn);
        coeffs[1] = (totForce & dragDir_)/(Aref_*pDyn);
        coeffs[2] = (totMoment & pitchAxis_)/(Aref_*lRef_*pDyn);

        scalar Cl = sum(coeffs[0]);
        scalar Cd = sum(coeffs[1]);
        scalar Cm = sum(coeffs[2]);

        scalar Clf = Cl/2.0 + Cm;
        scalar Clr = Cl/2.0 - Cm;

        writeTime(file(0));
        file(0)
            << tab << Cm << tab  << Cd
            << tab << Cl << tab << Clf << tab << Clr << endl;

        Log << type() << " " << name() << " write:" << nl
            << "    Cm    = " << Cm << nl
            << "    Cd    = " << Cd << nl
            << "    Cl    = " << Cl << nl
            << "    Cl(f) = " << Clf << nl
            << "    Cl(r) = " << Clr << endl;

        if (nBin_ > 1)
        {
            if (binCumulative_)
            {
                for (label i = 1; i < coeffs[0].size(); i++)
                {
                    coeffs[0][i] += coeffs[0][i-1];
                    coeffs[1][i] += coeffs[1][i-1];
                    coeffs[2][i] += coeffs[2][i-1];
                }
            }

            writeTime(file(1));

            forAll(coeffs[0], i)
            {
                file(1)
                    << tab << coeffs[2][i]
                    << tab << coeffs[1][i]
                    << tab << coeffs[0][i];
            }

            file(1) << endl;
        }

        Log << endl;
    }

    return true;
}


// ************************************************************************* //